Module 2-3 – Implementing and Verifying EIGRP pptx

This ability includes being able to meet these objectives: – Describe the commands used in a basic EIGRP configuration task – Explain how to configure a router to use wildcard masks to

BSCI Module 2-3 – Implementing and Verifying EIGRP

 Upon completing this lesson, you will be able to

describe how to implement EIGRP routing This ability includes being able to meet these objectives:

– Describe the commands used in a basic EIGRP configuration task

– Explain how to configure a router to use wildcard masks to select the interfaces and networks that will participate in EIGRP routing

– Configure the gateway of last resort or default route

– Verify that the router recognizes EIGRP neighbors and routes

– Verify EIGRP operations

Purpose of this Lesson

Coverage of topics new to the “EIGRP” module of BSCI

 What’s new in this module?

– Describe the commands used in a basic EIGRP configuration task

– Explain how to configure a router to use wildcard masks to select the interfaces and networks that will participate in EIGRP routing

– Configure the gateway of last resort or default route.

Configuring EIGRP

router eigrp autonomous-system-number

 Defines EIGRP as the IP routing protocol

 All routers in the internetwork that must exchange EIGRP routing updates must have the same autonomous system number

network network-number [wildcard-mask]

 Identifies attached networks participating in EIGRP.

 The wildcard-mask is an inverse mask used to

determine how to interpret the address The mask has wildcard bits, where 0 is a match and 1 is ―don’t care.‖

Router(config)#

Router(config-router)#

Configuring EIGRP (Cont.)

bandwidth kilobits

 Defines the interface’s bandwidth for the purposes of

sending routing update traffic

Router(config-if)#

Configuring EIGRP for IP

Network 192.168.1.0 is not configured on router A,

because it is not directly connected to router A.

Configuring EIGRP with IP (cont.)

Classful configuration example:

Using the Wildcard Mask in EIGRP

EIGRP Default Routes—Configuring

 Step 1: Create default-route

– R(config)#ip route 0.0.0.0 0.0.0.0 exit-INT or next-hop

 Step 2: Propagating a default route

 Option 2: Redistribute static

 Option 3: summary-address eigrp as-number 0.0.0.0 0.0.0.0

command for EIGRP

Using and Configuring the ip default-network

command for EIGRP

When you configure the ip default-network command,

a static route (the ip route command) is generated in

the router configuration However, the Cisco IOS software does not display a message to indicate this

The entry appears as a static route in the routing table

of the router in which the command is configured, as can be seen in the router A configuration and routing table in the figure This entry can be confusing if you want to remove the default network The configuration

must be removed with the no ip default-network

network command.

Example R1 EIGRP Configuration

ip address 192.168.1.102 255.255.255.224

<output omitted>

router eigrp 100 network 172.17.2.0 0.0.0.255 network 192.168.1.0

Verifying EIGRP: show ip eigrp neighbors

R1# show ip eigrp neighbors

IP-EIGRP neighbors for process 100

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

0 192.168.1.102 Se0/0/1 10 00:07:22 10 2280 0 5

R1#

H: It records the order in which the neighbors were learned.

SRTT: Average number of milliseconds it takes for an EIGRP packet to

be sent to this neighbor and for the local router to receive an

acknowledgment of that packet

RTO (retransmission timeout): Amount of time, in milliseconds, that

the router waits for an acknowledgment before retransmitting a reliable

packet from the retransmission queue to a neighbor

Q Cnt (queue count): Number of packets waiting in the queue to be

sent out

Seq Num: Sequence number of the last update, query, or reply packet

that was received from this neighbor

Verifying EIGRP: show ip route

C 172.16.1.0/24 is directly connected, FastEthernet0/0

192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.168.1.96/27 is directly connected, Serial0/0/1

D 192.168.1.0/24 is a summary, 00:05:07, Null0

Verifying EIGRP: show ip protocols

R1# show ip protocols

Routing Protocol is "eigrp 100"

Outgoing update filter list for all interfaces is not set Incoming update filter list for all interfaces is not set Default networks flagged in outgoing updates

Default networks accepted from incoming updates EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0 EIGRP maximum hopcount 100

EIGRP maximum metric variance 1 Redistributing: eigrp 100

EIGRP NSF-aware route hold timer is 240s

<output omitted>

Maximum path: 4 Routing for Networks:

172.16.1.0/24 192.168.1.0 Routing Information Sources:

Gateway Distance Last Update (this router) 90 00:09:38 Gateway Distance Last Update 192.168.1.102 90 00:09:40

Verifying EIGRP: show ip eigrp

interfaces

R1# show ip eigrp interfaces

IP-EIGRP interfaces for process 100

Xmit Queue Mean Pacing Time Multicast Pending Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes

Fa0/0 0 0/0 0 0/10 0 0

Se0/0/1 1 0/0 10 10/380 424 0

•The show ip eigrp interfaces command displays information about

interfaces configured for EIGRP This output includes the following key

elements:

•Interface: Interface over which EIGRP is configured

•Peers: Number of directly connected EIGRP neighbors

•Xmit Queue Un/Reliable: Number of packets remaining in the Unreliable

and Reliable transmit queues

•Mean SRTT: Mean smoothed round trip time (SRTT) interval, in milliseconds

•Pacing Time Un/Reliable: Pacing time used to determine when EIGRP

packets should be sent out the interface (unreliable and reliable packets)

•Multicast Flow Timer: Maximum number of seconds in which the router will

send multicast EIGRP packets

Verifying EIGRP: show ip eigrp

topology

R1# show ip eigrp topology

IP-EIGRP Topology Table for AS(100)/ID(192.168.1.101) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,

r - reply Status, s - sia Status

•Update (U): This code applies if a network is being updated (placed in an update packet) This code also

applies if the router is waiting for an acknowledgment for this update packet

•Query (Q): This code applies if there is an outstanding query packet for this network other than being in the

active state This code also applies if the router is waiting for an acknowledgment for a query packet.

•Reply (R): This code applies if the router is generating a reply for this network or is waiting for an

acknowledgment for the reply packet.

•Stuck-in-active (SIA) status: This code signifies an EIGRP convergence problem for the network with which

it is associated.

•The number of successors available for a route is indicated in the command output In this example, all

Verifying EIGRP: show ip eigrp

traffic

R1# show ip eigrp traffic

IP-EIGRP Traffic Statistics for AS 100 Hellos sent/received: 429/192

Updates sent/received: 4/4 Queries sent/received: 1/0 Replies sent/received: 0/1 Acks sent/received: 4/3 Input queue high water mark 1, 0 drops SIA-Queries sent/received: 0/0

SIA-Replies sent/received: 0/0 Hello Process ID: 113

PDM Process ID: 73

 The configuration commands for basic EIGRP include:

 The optional wildcard-mask parameter in the network

command is an inverse mask used to determine how to interpret the network-number A wildcard bit of 0 is a match and of 1 is “don’t care”

 Create and advertise a default route in an EIGRP

autonomous system with the ip default-network network-number command.

Summary (cont.)

 Use the show ip eigrp neighbors command to

verify that the router recognizes its neighbors Use the

show ip route eigrp command to verify that the

router recognizes routes from its neighbors

 Use the show ip protocols, show ip eigrp

interfaces, show ip eigrp neighbors, show

ip eigrp topology, and show ip eigrp traffic commands to verify EIGRP operations.

–

 Create a simple network using EIGRP as your routing

protocol These steps were discussed at the beginning

of this module

 Verify your connections by running the show

commands discussed in the module:

show ip eigrp neighbors, show ip eigrp topology,

 Reflection: Are your routes displayed correctly in the

routing table and identified as both directly connected

or EIGRP?

Self Check

 Which show command verifies the router can recognize

its neighbors?

 Show ip route eigrp has what function?

 What command establishes EIGRP as the routing

protocol?

 Identify the command to create and advertise a default

route in an EIGRP autonomous system

 Configuring EIGRP

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